It’s a question of are the drivers “good” as in recones or non Jbl recones and of the compression driver and slot are good?
You need to see the foilcal of the 2405. If it’s removed or damaged that’s a problem
If this system has been recycled on eBay it’s likely the drivers are not original with the stock factory enclosure
The authenticity is much about the drivers foilcal’s serial numbers and the cone kits and diaphragms
Drivers can be fixed up as in refoamed or new diaphragm but you need to know if they have genuine jbl cone kits and diaphragms? The 2405s often have Chinese knock off diaphragms.
You don’t want Frankenstein woofers that are the basket of another model Jbl woofer.
Ask if the woofer has the original Jbl cone kit. Same with the 2121 and the compression driver diaphragm?
It will have Jbl markings on the under side of the cone
See if he will send you pic with the woofer removed.
You need to establish if the crossover is stock or has been updated?
If it’s not this do not proceed.
http://www.audioheritage.org/vbullet...l=1#post370561
So l would ask for pics of the drivers on a table with a local newspaper
If not save yourself a long drive.